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Coal tar desalination process

A technology for coal tar and desalination, applied in the field of coal tar desalination technology, can solve the problems of unclear separation of oil-water interface, difficult and stable operation, poor operation effect, etc., and achieve the effect of avoiding sedimentation and fouling, stable operation and good effect.

Active Publication Date: 2015-09-16
SHANDONG BAOTA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electric desalination temperature needs to be operated at 110-140°C. If the temperature is too high, the salt will be decomposed, and if the temperature is too low, the efficiency will be low. In the traditional electric desalination process, the oil-water emulsion layer easily leads to unclear separation of the oil-water interface, and the operation is not stable; During the long-term use of the electric desalination tank, the impurities in the oil will settle and deposit in the electric desalination tank, which will lead to poor operation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Desalinated water is injected into a conventional commercial coal tar, the volume ratio of the demineralized water to coal tar is 3%, the coal tar after adding desalinated water is heated to 90°C, and then the first-stage dehydration is carried out through a decanter centrifuge. The screw centrifuge speed is 3100r / min, and the solid phase (slag) with a particle size greater than 50 microns is removed, and the water content is less than 2%, and then the disc centrifuge is used for secondary dehydration. The disc centrifuge speed is 4000r / min, remove the solid phase with a particle size between 5-50 microns, and dehydrate to less than 0.5% water content. The coal tar after the treatment is tested, and the desalination rate is 99.9% after the above treatment. Coal tar undergoes further hydroprocessing.

Embodiment 2

[0019] Desalinated water is injected into a conventional commercial coal tar, the volume ratio of the demineralized water to coal tar is 4%, the coal tar after adding desalinated water is heated to 85°C, and then the first-stage dehydration is carried out through a decanter centrifuge. The screw centrifuge rotates at 3000r / min, removes the solid phase (slag) with a particle size greater than 50 microns, and dehydrates it to a water content below 2%, and then passes through the disc centrifuge for secondary dehydration. The disc centrifuge rotates at 4000r / min, remove the solid phase with a particle size between 5-50 microns, and dehydrate to less than 0.5% of the water content. The coal tar after the treatment is tested, and the desalination rate is 99.6% after the above treatment. Coal tar undergoes further hydroprocessing.

Embodiment 3

[0021] Desalinated water is injected into a conventional commercial coal tar, the volume ratio of the demineralized water to coal tar is 5%, the coal tar after adding the demineralized water is heated to 95℃, and then the first-stage dehydration is carried out by a decanter centrifuge. The screw centrifuge speed is 3200r / min, and the solid phase (slag) with a particle size greater than 50 microns is removed, and the water content is less than 2%, and then the disc centrifuge is used for secondary dehydration. The disc centrifuge speed is 4100r / min, remove the solid phase with a particle size between 5-50 microns, and dehydrate to less than 0.5% of the water content. The coal tar after the treatment is tested, and the desalination rate is 99.7% after the above treatment. Coal tar undergoes further hydroprocessing.

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Abstract

The invention belongs to the field of coal chemical processes, and in particular relates to a coal tar desalination process which comprises the following steps: filling desalted water into coal tar, heating to 85-95 DEG C, performing first-stage dehydration by using a horizontal screw centrifuge to remove solid phase of which the particle size is greater than 50mu m, dehydrating until the water content is less than 2%, performing second-stage dehydration by using a flottweg separator so as to remove solid phase of which the particle size is within 5-50mu m, dehydrating until the water content is 0.5% or below, and performing hydrotreating on the treated coal tar. The coal tar desalination process provided by the invention is good in desalination effect, and stable to operate, the desalination rate is greater than 99.5%, the temperature is lower than that of electric desalination, the process is easy to operate, salt decomposition can be avoided, the problem that an oil-water interface cannot be completely separated in a conventional electric desalination process can be avoided, and the problem that an electric desalination tank has sedimentation and scaling can be also avoided.

Description

Technical field [0001] The invention belongs to the field of coal chemical technology, and specifically relates to a coal tar desalination process. Background technique [0002] The salt content of coal tar is extremely harmful to production and processing. A small amount of salt is suspended in the oil as crystals, which severely corrodes the equipment, or crystallizes out on the upper tray of the atmospheric tower, blocking the tray, causing unclear separation of light components ; Secondly, in the furnace tube and heat exchange equipment, salt deposits on the tube wall and scales, which affects heat transfer, and at the same time shortens the life of the furnace tube, increases the pressure drop, and can block the furnace tube or heat exchanger in severe cases. Cause the device to stop working; the third is the impact of heavy metals on subsequent devices. Metal sodium has a destructive effect on the crystal lattice of the catalyst, which is easy to poison the catalyst and cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/00C10C1/19
CPCC10C1/005C10C1/19
Inventor 刘波王开义王继龙
Owner SHANDONG BAOTA NEW ENERGY CO LTD
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